Plug gauge



- mwws E. G. STRONG Get. 2 1923.

PLUG GAUGE Filed Nov. 1, 192g new manner a. amend, or omen, o'nro, 'assrenoa ro rmxnn noun.

- mm, or cannon, onto, a conroas'rron or care..

' nave canon Application filed November l, 1922. Serial No. 598,297. v

ofythe handle. The cap 12 has a bore in To all whom it may concern:

' Be itknown that 'I, Enm'r G. STRONG,

a citizen of the United States, and a resi-.

dent ofthe city of Canton, in the county of Stark and State of Ohio, .have, invented a new and useful Improvement in Plug Gauges, of which the following is a specification.

Myin'vention relates toplug gauges and has for its principal object to producea gauge that can be read by the sense of touch, and by means of which it can be easily and accurately determined whether the conical bore of a roller bearing cone or the like is properly sized. 1

The invention consists principally 1n a plug having a relatively movable indicating member that can be read by feeling with the thumb or a finger. he invention further consists in the plug gauge and in the parts and combinations of parts hereinafter described and claimed.

' In the accompanying drawing, I Fig. 1 is a longitudinal sectional-view of a lug embodying my invention; and ig. 2 is an end view thereof. p

The plug gauge comprises a handle I having a conical end 2 that is inserted in the conical bore of a roller bearing cone 3-01 other. article, a roller bearing cone 'being indicated in dotted lines in Fig. 1.

The handle 1 has a bore that is in axial alinement with the conical end and in said bore fits a plunger 4. The bore may be. enlarged through'most of its length 5 leaving comparatively small portions 6. that fit the plunger and constitute guides therefor.

A cross piece 7 is mounted at the end of the plun r4 as by means of. a threaded portion oft e plunger 8 extending into a screw threaded hole in the cross piece. The handle 1 is provided withslots 9 through which the ends of the cross piece project. Theend portions 10, of the face toward the conical end of the plug are hardened and provided with ve smooth surfaces that lie in a plane perpendicular to the axis of the plunger 4.

The end 11 of the handle is screw threaded to receive the threaded portion of a-cap 12:

that has a flange 13 overlapping the end axial alinement with the bore of the handle The handle is grasped by the hand of the user as indicatedin dotted lines in Fig. 1 and the conical end is inserted in the conical bore of a roller bearin cone or the like.

and the end portion 142 of the plunger 4 is ounted'on the pin 14 lunger and.

This may be done whi e the cone is in a grinding machine or other machine that slzes the bore thereof; The endsof a face of the cross piece abut against the end of the cone. The larger the bore or the cone, the further the conical end of the plug can be inserted into it, and the greater will be the relative movement of the plunger and handle. In" ractice the plug gauge is so- I constructed t at when the bore of the cone being ga d is undersized, the end of the plunger alls short of reaching the face .of-

the ca' when the here is correctly sized, the. end- 0 the plunger is exactly flush with the face of the ca and when the bore lS'OVBT'.

sized, the en of the. plunger projects beyond the face of the cap.

The osition of the plu the ban leis perceived by rub .ing. the humb or a finger across the end of the andle.

The thumb and fingers are, of'course, very' sensitive, that slight differences in the relative position of the plunger and cap are easily perceived and the size of the bore of the cone is easily and accurately god.

The .plug gauge above descr bed has numerous advantages. It is simple and easy to o crate. It eliminates the necessity for read ng a scale or observing the movement of a pointer. It requires the use of only one hand.

Obviously numerous changes may be made or relative to ing a conical end and a bore extendingtltl) ineasea without departing from the invention and it do not wish to be limited to the precise construction shown.

What I claim is:

1. A gauge for gaging the conical bore of roller bearing cones and the like, comprising a handle having a conical end and a longitudinal bore extendingthrough the opposite end, and a member movable, endwise in said bore by the article being gaged,

and of such length that its end is substantially flush with the end of the handle when a normal article is gaged whereby the position of said member and the bore of the article may be determined bythe sense of touch.

2. A plug gauge comprising ahandle havby articles of correct size. a p

3. A plug gauge comprising a handle' having a onical end and a bore in axial alinement with said conical end, a plunger fitting in said bore and movable endwise thereof, a crosspiece removably secured at the'end of said plunger, said crosspiece pro- ?ectin through elongated holes provided there or in said handle and having a face in a plane perpendicular to the axis ofsaid handle and being adapted to abut againstthe article being gaged, and yieldable means tending to keep said crosspiece adjacent to the conical end of the handle, whereby said plunger is responsive to thesize of the-bore,

of the article being gaged and said size is determined b feeling the position of the plunger relative to the handle.

a. A plug gauge comprising a handle having a. conical end and a bore in axial alinement with said conical end, a plunger fitting in said bore and movable endwisethereof and a crosspi'ece secured at the end" of said plunger, ,said crosspiece projecting through holes provided therefor in said handle and having a face in aplane perpendicular tovthe axis of said handle and being adapted to abut against the article being gaged, whereby said plunger is responsi've to the size of the bore of the artiole being gaged and mid size is determined by feeling the position of the plunger relative to the handle. t

5. A plug gauge comprising a handle having arconlcal end and a bore iii-axial alinement with'said' conical end, a cap in i the end of said handleif l said cap having an axial bore a plunger tting in the bore of said handle and having a reduced portion extendinginto "the bore of said cap, saidv plunger being movable cndwise of said handie, and provided with a -member-that is adapted to abut against the article being gaged, whereby said plunger is responsive to the size of the bore of the article being gaged and said sizeis determined by feeling the position of the end of the plurigerrel ativeto thesurface-of said cap.

- 6. A plug gauge. comprising a handle having a conical end and a bore in axial alinement with said conical end, a cap in the end of said handle, said cap having an axial bore, a plunger fitting in the bore of said handle and having a-reduced portion extending into the bore of said cap, said plunger being movable endwise of said handle and providedflwith a member-that is adapted to :abut against the article being gaged, and a spring on the reduced portion of said plunger bearing against said cap and the body portion of the plunger, whereby said plungeris responsive to the size of the bore of the article beinggaged and said size is determined b feelingthe positionofthe end of the p unger relative to the -surface of said cap.

7. A plug gauge comprising a" conical plug adapted tobe' inserted in the conical bore of an article to gauge the same, a ban dle therefor, and a member movable relative to said handle and adapted to'abut against the article being gaged to be moved thereby, said handle having a'surface transverse to the axis of said movable member and in position to be pressed by the thumb of the hand that grasps said handle and said member having a surface that becomes flush with'said first named surface when articles with normal size bores aregaged; I

8. A plug gauge com rising a handle having a conical end an alinement with said conical end, a cap in the end of said handle opposite said conical end, said cap having an axial bore, a plunger fitting in the bore of said handle and having a reduced portion extending into the bore of said cap, said plunger bea .bore in axial ing movable endwise of said handle andbeing provided with a crosspiece,- said crosspiece projecting through elongated ,holes provided therefor in said handle and beingadapted to abut against the end'of the article beinggaged, whereby the plunger is responsive to the size of the bore of the article being gaged, the endof the plunger and the end ofthe cap being fl'ushwhenthe conical end is inserted in vthe bore of an article thatis correctly sized.

9.,A plug gauge comprising a, handle having a. conical end an a bore in axial alinement with saidv conical end, a cap in the end of said handle opposite said conical end',\said cap havingv an aerial bore, a

plunger fitting in the bot-eel? said handle M w .e

and having e. reduced portion extending of the handle, whereby the 'plun er is re- 10 into the bore of said cap, said plunger bes' onsive to the size of the bore 0 the artiing movable endwise of said handle and be c e being gaged,' the end of the plun r and ing provided with a crosspiece, said crossthe end ,of the'cap being flush when t e con- 6 piece projecting throu h elongated holes ical end is inserted in the bore of an article provided therefor in said handle end-being that is correctl sized. ada ted to abut against the end of the arti- Signed at 'anton, Ohio, this 25th day -cle ing gaged, and a spring adapted to of October; 1922. v press the plunger toward the conical end ERNEST G. STRONG. 

